She drew on subaudi courage during the surgery.

Even when she left the room without saying goodbye, I could subaudi her meaning and felt the sadness she refused to express.

She restored the damaged folios subaudi, mentally supplying missing phrases where the ink had faded.

The subaudible hum from the machinery made concentrating difficult, even though few could consciously hear it.

She muttered subaudibly, so only those closest could make out her words.